CN102545891A - Digital signal frequency discriminator and frequency discriminating method - Google Patents
Digital signal frequency discriminator and frequency discriminating method Download PDFInfo
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- CN102545891A CN102545891A CN2010106120507A CN201010612050A CN102545891A CN 102545891 A CN102545891 A CN 102545891A CN 2010106120507 A CN2010106120507 A CN 2010106120507A CN 201010612050 A CN201010612050 A CN 201010612050A CN 102545891 A CN102545891 A CN 102545891A
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Abstract
The invention discloses a digital signal frequency discriminator and a frequency discriminating method. The digital signal frequency discriminator can be used for directly estimating a frequency deviation value according to an integral result of a current integral time unit, but the result of a historical integral time unit is not needed to be waited, so that the negative effect of data bit jumping to a conventional frequency discriminator is eliminated.
Description
Technical field
The present invention relates to the electron trade digital processing field, relate in particular to a kind of digital signal frequency discriminator and frequency discrimination method.
Background technology
At present; GLONASS (Global Navigation Satellite System; Guide number SS) the signal trace technology adopts phase-locked loop (Phase Locked Loop is called for short PLL) and FLL (Frequency Locked Loop is called for short FLL) technology more.PLL has advantages such as phase noise characteristic is good, but capture range and dynamically just not fully up to expectations; FLL is because follow the tracks of the frequency of input signal, thus capture range with dynamically all be superior to PLL, so the applications of and small-signal dynamic at height is more, but its phase noise is bigger.Because the GNSS signal adopts CDMA more, in order to obtain big as far as possible processing gain, the correlation intergal time of tracking loop, the longer the better; But because saltus step can take place the adjacent data bit, so the longest general correlation intergal time is the length of data bit.Fig. 1 is the realization block diagram of prior art digital signal frequency discriminator.As shown in Figure 1, the result of unit when the structure of conventional frequency discriminator often relates to adjacent two integrations.The calculating of frequency error has some kinds of modes, and is commonly used shown in table one:
Table one: use frequency discriminator and characteristic thereof always for several kinds
Because the data bit saltus step is equivalent to a phase step for carrier phase, be exactly a frequency discontinuity so be reflected on the frequency, will certainly produce harmful effect to the output of frequency discriminator if can not eliminate this mutation effect.At present for the influence of data bit saltus step, often take the method that afterwards detects, when detecting current integral result when opposite, then do not adopt the output adjustment FLL loop of current frequency discriminator with previous integral result phase place.Can make that so on the one hand the time interval of FLL loop adjustment is inconsistent, also can influence the tracking noise characteristic of FLL loop on the other hand.An extreme example, if saltus step always takes place the adjacent data bit, then the FLL loop just loses the adjustment function.
In realizing process of the present invention, the inventor recognizes that there is following technical problem in prior art: unit during the historical integration of frequency discriminator needs, the influence that can not avoid the data bit saltus step that frequency discriminator is exported.
Summary of the invention
The technical problem that (one) will solve
To above-mentioned technical problem, the present invention proposes a kind of digital signal frequency discriminator.The integral result of unit had been evaded the influence of the variation of a last data bit to current frequency discriminator output when this frequency discriminator only needed current integration, made loop correlation intergal time span no longer receive the influence of data bit length.
(2) technical scheme
According to an aspect of the present invention, a kind of digital signal frequency discriminator is provided, has comprised forward off frequency carrier passage, negative sense off frequency carrier passage, frequency deviation energy difference unit and frequency adjustment unit.Forward off frequency carrier passage; Be connected with local carrier equipment with input intermediate frequency equipment; Be used on the local intermediate-freuqncy signal that local carrier equipment produces, adding preset frequency deviation; Obtain forward off frequency carrier signal, the forward off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal, obtain the energy of forward off frequency carrier signal.Negative sense off frequency carrier passage; Be connected with local carrier equipment with input intermediate frequency equipment; Be used on the local intermediate-freuqncy signal that local carrier equipment produces, subtracting preset frequency deviation; Obtain negative sense off frequency carrier signal, the negative sense off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal, obtain the energy of negative sense off frequency carrier signal.Frequency deviation energy difference unit is connected with negative sense off frequency carrier passage with forward off frequency carrier passage, is used for the energy according to forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal.The frequency adjustment unit is connected with local carrier equipment with frequency deviation energy difference unit, is used for according to positive negative frequency deviation energy difference signal the local intermediate-freuqncy signal of local carrier equipment being adjusted.
Preferably, in the digital signal frequency discriminator of the present invention, preset frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the correlation intergal time is for obtaining the correlation intergal time of forward/negative sense off frequency carrier signal energy.Optimally, preset frequency deviation is to make the digital signal frequency discriminator work in the frequency deviation of the linear zone of frequency discrimination indicatrix.
Preferably, digital signal frequency discriminator of the present invention also comprises local intermediate-freuqncy signal passage and energy difference normalization unit.Local intermediate-freuqncy signal passage is connected with local carrier equipment with input intermediate frequency equipment, is used for doing correlation intergal according to local intermediate-freuqncy signal and input intermediate-freuqncy signal, obtains the energy of local intermediate-freuqncy signal.Energy difference normalization unit is connected with frequency deviation energy difference unit with local intermediate-freuqncy signal passage, is used for the energy value according to local intermediate-freuqncy signal, aligns negative frequency deviation energy difference signal and carries out the normalization processing.The frequency adjustment unit is connected with energy difference normalization unit, is used for according to the positive negative frequency deviation energy difference signal after the normalization processing the local intermediate-freuqncy signal of local carrier equipment being adjusted.Optimally, forward off frequency carrier passage, negative sense off frequency carrier passage and local intermediate-freuqncy signal passage are handled based on synchronous input intermediate-freuqncy signal.
Preferably, digital signal frequency discriminator of the present invention also comprises: phase discriminator, be connected with local intermediate-freuqncy signal passage, and be used for obtaining amount of phase error according to the input intermediate-freuqncy signal, local intermediate-freuqncy signal is carried out the phase-locked loop adjustment.
Preferably, digital signal frequency discriminator of the present invention also comprises: the loop filtering unit, be connected between frequency deviation energy difference unit and the frequency adjustment unit, and be used for the noise of the positive negative frequency deviation energy difference of filtering signal.
Preferably, in the digital signal frequency discriminator of the present invention, forward off frequency carrier passage comprises first multiplier and first integral device.Wherein: this first multiplier, be connected with local carrier equipment with input intermediate frequency equipment, be used on local intercarrier signal, adding preset frequency deviation, obtain forward off frequency carrier signal; This first integral device is connected with first multiplier, is used for obtaining through correlation intergal the energy of forward off frequency carrier signal.Negative sense off frequency carrier passage comprises second multiplier and second integral device; Wherein: this second multiplier; Be connected with local carrier equipment with input intermediate frequency equipment, be used on the local intermediate-freuqncy signal that local carrier equipment produces, subtracting preset frequency deviation, obtain negative sense off frequency carrier signal; This second integral device is connected with second multiplier, is used for obtaining through correlation intergal the energy of negative sense off frequency carrier signal.
Preferably, in the digital signal frequency discriminator of the present invention, the frequency adjustment unit is a voltage controlled oscillator, and frequency deviation energy difference unit is a subtracter.
A kind of method of digital signal frequency discrimination also is provided according to another aspect of the present invention.This method comprises: on the local intermediate-freuqncy signal that local carrier equipment produces, add preset frequency deviation; Obtain forward off frequency carrier signal; The forward off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal, obtain the energy of forward off frequency carrier signal; On the local intermediate-freuqncy signal that local carrier equipment produces, subtract preset frequency deviation, obtain negative sense off frequency carrier signal, the negative sense off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal, obtain the energy of negative sense off frequency carrier signal; According to the energy of forward off frequency carrier signal and negative sense off frequency carrier signal, obtain positive negative frequency deviation energy difference signal; According to positive negative frequency deviation energy difference signal, local intermediate-freuqncy signal is adjusted.
(3) beneficial effect
Digital signal frequency discriminator of the present invention and frequency discrimination method; The integral result direct estimation of unit goes out frequency deviation value in the time of can be according to current integration; And the result of unit when need not to wait for historical integration; Eliminated the negative effect of data bit saltus step on the one hand, can improve the correlation intergal time on the other hand, thereby promoted the dynamic range and the noise characteristic of FLL track loop conventional frequency discriminator.
Description of drawings
Fig. 1 is the realization block diagram of prior art digital signal frequency discriminator;
Fig. 2 is the sketch map of embodiment of the invention digital signal frequency discriminator;
Fig. 3 is the sketch map of embodiment of the invention digital signal frequency discriminator;
Fig. 4 is the sketch map of embodiment of the invention digital signal frequency discriminator;
Fig. 5 is the flow chart of embodiment of the invention digital signal frequency discrimination method;
Fig. 6 is the sketch map of embodiment of the invention digital signal frequency discriminator;
Fig. 7 is the sketch map of embodiment of the invention digital signal frequency discriminator carrier wave frequency deviation;
Fig. 8 is the kam-frequency characteristic that embodiment of the invention digital signal frequency discriminator is provided with according to first frequency deviation;
Fig. 9 is the kam-frequency characteristic that embodiment of the invention digital signal frequency discriminator is provided with according to second frequency deviation;
Figure 10 is the kam-frequency characteristic that embodiment of the invention digital signal frequency discriminator is provided with according to the 3rd frequency deviation.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
For conveniently understanding the present invention, at first some notions that occur among the present invention are described.Among the present invention, the input intermediate-freuqncy signal refers to the signal that receives and obtain through the radio frequency mixing from antenna; Local intermediate-freuqncy signal is the local carrier signal that produces, and forward off frequency carrier signal and negative sense off frequency carrier signal all are the local carrier signal that produces, but compares the preset frequency deviation with forward and negative sense with local intermediate-freuqncy signal.
Fig. 2 is the sketch map of embodiment of the invention digital signal frequency discriminator.As shown in Figure 2, in one exemplary embodiment of the present invention, the digital signal frequency discriminator comprises: forward off frequency carrier passage 201, negative sense off frequency carrier passage 202, frequency deviation energy difference unit 203 and frequency adjustment unit 204.Wherein, Forward off frequency carrier passage 201; Be connected with local carrier equipment 300 with input intermediate frequency equipment 200, be used on the local intermediate-freuqncy signal that local carrier equipment 300 produces, adding preset frequency deviation, obtain forward off frequency carrier signal; The forward off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment 200 inputs are done correlation intergal, obtain the energy of forward off frequency carrier signal; Negative sense off frequency carrier passage 202; Be connected with local carrier equipment 300 with input intermediate frequency equipment 200; Be used on the local intermediate-freuqncy signal that local carrier equipment 300 produces, subtracting preset frequency deviation; Obtain negative sense off frequency carrier signal, the negative sense off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment 200 inputs are done correlation intergal, obtain the energy of negative sense off frequency carrier signal; Frequency deviation energy difference unit 203 is connected with negative sense off frequency carrier passage 202 with forward off frequency carrier passage 201, is used for the energy according to forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal; Frequency adjustment unit 204 links to each other with frequency deviation energy difference unit 203, is used for according to positive negative frequency deviation energy difference signal the local intermediate-freuqncy signal of local carrier equipment 300 being adjusted.
Preferably, in the present embodiment, preset frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the correlation intergal time is for obtaining the time of integration of forward/negative sense off frequency carrier signal energy.Optimally, preset frequency deviation is to make the digital signal frequency discriminator work in the frequency deviation of the linear zone of frequency discrimination indicatrix.
The integral result of unit when the digital signal frequency discriminator that present embodiment provided only needs current integration; Evaded the influence of the variation of a last data bit to current frequency discriminator output; Make loop correlation intergal time span no longer receive the influence of data bit length, improved its frequency discrimination performance.
Fig. 3 is the sketch map of embodiment of the invention digital signal frequency discriminator.As shown in Figure 3; In further embodiment of the present invention; The digital signal frequency discriminator also comprises local IF carrier passage 301 and energy difference normalization unit 302, and wherein: local IF carrier passage 301 is connected with local carrier equipment 300 with input intermediate frequency equipment 200; Be used for doing correlation intergal, obtain the energy of local intermediate-freuqncy signal according to local intermediate-freuqncy signal and input intermediate-freuqncy signal; Energy difference normalization unit 302 is connected with frequency deviation energy difference unit 203 with local intermediate-freuqncy signal passage 301, also is used for the energy value according to local intermediate-freuqncy signal, aligns negative frequency deviation energy difference signal and carries out the normalization processing; Frequency adjustment unit 204 is connected with energy difference normalization unit 302, is used for according to the positive negative frequency deviation energy difference signal after the normalization processing local intermediate-freuqncy signal being adjusted.Preferably, in the present embodiment, forward off frequency carrier passage, negative sense off frequency carrier passage and local intermediate-freuqncy signal passage carry out based on synchronous input intermediate-freuqncy signal.
The energy of the local intercarrier signal of the digital signal frequency discriminator utilization that present embodiment provided aligns negative frequency deviation energy difference signal and carries out the normalization processing.Above-mentioned normalization is handled the energy difference signal that can as far as possible reduce positive negative frequency deviation and is imported the intermediate-freuqncy signal effect of energy change, especially in the suddenly big or suddenly small situation of input signal, such as the situation that constantly is blocked or reflects at built-up regional signal.Therefore, in the digital signal frequency discriminator, add the energy normalized unit, can improve the precision of positive negative frequency deviation energy signal, further improved the frequency discrimination performance of digital signal frequency discriminator.
Fig. 4 is the sketch map of embodiment of the invention digital signal frequency discriminator.As shown in Figure 4, in a preferred embodiment of the invention, the digital signal frequency discriminator also comprises phase discriminator 401; Wherein: phase discriminator 401; Be connected with local intermediate-freuqncy signal passage 301, be used for obtaining amount of phase error, local intermediate-freuqncy signal is carried out the phase-locked loop adjustment according to the input intermediate-freuqncy signal.The digital signal frequency discriminator also comprises loop filtering unit 402, wherein: loop filtering unit 402, be connected between frequency deviation energy difference unit 203 and the frequency adjustment unit 302, be used for the noise of the positive negative frequency deviation energy difference of filtering signal.
The integral result of unit just drew frequency deviation information when the digital signal frequency discriminator of present embodiment only utilized current integration; And the integral result of need not depend on history time unit; Adopted irrelevant Integral Technology simultaneously, made the output not influence of telegraph text data bit saltus step, thereby make that the adjustment of FLL loop is more steady for frequency discriminator; The correlation intergal time be can increase, thereby the dynamic range and the noise characteristic of FLL track loop promoted.
Corresponding with above-mentioned device embodiment, the present invention also provides a kind of method of digital signal frequency discrimination.Fig. 5 is the flow chart of embodiment of the invention digital signal frequency discrimination method.As shown in Figure 5, this method comprises:
Step S502; On the local intermediate-freuqncy signal that local carrier equipment produces, add preset frequency deviation; Obtain forward off frequency carrier signal, the forward off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal, obtain the energy of forward off frequency carrier signal;
Step S504; On the local intermediate-freuqncy signal that local carrier equipment produces, subtract preset frequency deviation; Obtain negative sense off frequency carrier signal, the negative sense off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal, obtain the energy of negative sense off frequency carrier signal;
Step S506 according to the energy of forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal;
Step S508 according to positive negative frequency deviation energy difference signal, adjusts local intermediate-freuqncy signal.
In this article, all additional technical features all are applicable to device embodiment and method embodiment simultaneously, and explanation no longer separately.To be example below, optimum embodiment of the present invention will be described with concrete device.
The invention provides the method for the digital signal frequency discrimination in a kind of GNSS receiver; This method is through increasing two-way I; The Q integrator; Carry out integration with forward off frequency carrier signal, negative sense off frequency carrier signal respectively, obtain difference on the frequency through the two paths of signals energy difference, this difference on the frequency is meant the difference on the frequency of input intermediate-freuqncy signal and local intermediate-freuqncy signal.
Fig. 6 is the sketch map of embodiment of the invention digital signal frequency discriminator.As shown in Figure 6; In the present embodiment, in the carrier tracking loop (section's Stas ring) of routine, increase a forward off frequency carrier passage and a negative sense off frequency carrier passage; Each passage comprises an I road integrator (2) and multiplier (1) and a Q road integrator (2) and multiplier (1).The I of forward off frequency carrier, Q integrator are corresponding to cos (ω
I+ ω
D) t and sin (ω
I+ ω
D) t, the I of negative sense carrier wave frequency deviation, the Q integrator is corresponding to cos (ω
I-ω
D) t and sin (ω
I-ω
D) t.On the basis of above-mentioned hardware, the method for present embodiment may further comprise the steps:
Step 12; On the output basis of local intermediate-freuqncy signal NCO; Add a forward frequency deviation and a negative sense frequency deviation, and output homophase and quadrature carrier components, wherein; The value of two-way carrier shift should be local relatively the intermediate-freuqncy signal symmetry, frequency values of its concrete skew is by required kam-frequency characteristic curve decision.
Fig. 7 is the sketch map of embodiment of the invention digital signal frequency discriminator carrier wave frequency deviation.Among Fig. 7; Mid portion is conventional numerically-controlled oscillator (Numerical Controlled Oscillator is called for short NCO), i.e. the NCO component of local intermediate-freuqncy signal; On this basis; Its NCO is provided with to be increased frequency deviation respectively and reduces frequency deviation, shown in Fig. 7 middle and upper part and bottom, obtains forward and negative sense carrier wave frequency deviation component respectively;
Step S14; At two-way I; The Q integrator carries out energy integral to input intermediate-freuqncy signal, forward off frequency carrier and negative sense off frequency carrier respectively; In this step, forward off frequency carrier correlation intergal, negative sense off frequency carrier energy integral should with local intermediate-freuqncy signal correlation intergal sync correlation input signal in time, promptly three tunnel correlation intergals all are to carry out to identical input intermediate-freuqncy signal;
Step S16; The energy
of forward frequency deviation integral result and the energy
of negative sense frequency deviation integral result are wanted to subtract, obtain positive negative frequency deviation energy difference; The result's of forward and negative sense frequency deviation correlation intergal I, Q component carry out irrelevant processing
makes final energy difference not receive the influence of data bit symbol;
Step S18 after positive negative frequency deviation energy difference carried out normalization and handle, just obtains the difference on the frequency of local intercarrier signal and input intermediate-freuqncy signal;
Step S20 gives the adjustment that loop filter carries out loop tracks with difference on the frequency, and preferably, the normalization process of positive negative frequency deviation energy difference can level and smooth later result be carried out according to the energy of local intermediate-freuqncy signal integration;
Step S22 simultaneously, can also obtain amount of phase error according to the integral result of local intermediate-freuqncy signal component, carries out the adjustment of PLL.
Fig. 8-10 is the kam-frequency characteristic that embodiment of the invention digital signal frequency discriminator is provided with according to different frequency deviations; The correlation intergal time span of Fig. 8, Fig. 9, Figure 10 is 1 millisecond, and positive negative frequency deviation is respectively 500Hz, and 200Hz and 100Hz can find out the frequency discrimination curve under different frequency deviations are provided with.Should choose positive negative frequency deviation setting flexibly with the correlation intergal time span according to the linear characteristic of frequency discrimination curve in actual the use, the principle of its set point is to make frequency discriminator work in the drawings in the linear zone of redlining.And the difference on the frequency of frequency discriminator output also should determine real frequency values according to correlation intergal duration and normaliztion constant.
Digital signal frequency discriminator of the present invention and frequency discrimination method; The integral result direct estimation of unit goes out frequency deviation value in the time of can be according to current integration; And the result of unit when need not to wait for historical integration; Eliminated the negative effect of data bit saltus step on the one hand, can improve the correlation intergal time on the other hand, thereby promoted the dynamic range and the noise characteristic of FLL track loop conventional frequency discriminator.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a digital signal frequency discriminator is characterized in that, comprises forward off frequency carrier passage, negative sense off frequency carrier passage, frequency deviation energy difference unit and frequency adjustment unit, wherein:
Said forward off frequency carrier passage; Be connected with local carrier equipment with input intermediate frequency equipment; Be used on the local intermediate-freuqncy signal that said local carrier equipment produces, adding preset frequency deviation; Obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of said forward off frequency carrier signal and the input of said input intermediate frequency equipment is done correlation intergal, obtain the energy of said forward off frequency carrier signal;
Said negative sense off frequency carrier passage; Be connected with local carrier equipment with input intermediate frequency equipment; Be used on the local intermediate-freuqncy signal that said local carrier equipment produces, subtracting said preset frequency deviation; Obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of said negative sense off frequency carrier signal and the input of said input intermediate frequency equipment is done correlation intergal, obtain the energy of said negative sense off frequency carrier signal;
Said frequency deviation energy difference unit is connected with negative sense off frequency carrier passage with said forward off frequency carrier passage, is used for the energy according to said forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal;
Said frequency adjustment unit is connected with said local carrier equipment with said frequency deviation energy difference unit, is used for according to said positive negative frequency deviation energy difference signal the local intermediate-freuqncy signal of local carrier equipment being adjusted.
2. digital signal frequency discriminator according to claim 1; It is characterized in that; Said preset frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the said correlation intergal time is for obtaining the correlation intergal time of said forward/negative sense off frequency carrier signal energy.
3. digital signal frequency discriminator according to claim 2 is characterized in that, said preset frequency deviation is to make said digital signal frequency discriminator work in the frequency deviation of the linear zone of said frequency discrimination indicatrix.
4. digital signal frequency discriminator according to claim 1 is characterized in that, also comprises local intermediate-freuqncy signal passage and energy difference normalization unit, wherein:
Said local intermediate-freuqncy signal passage is connected with local carrier equipment with said input intermediate frequency equipment, is used for doing correlation intergal according to local intermediate-freuqncy signal and input intermediate-freuqncy signal, obtains the energy of said local intermediate-freuqncy signal;
Said energy difference normalization unit is connected with said frequency deviation energy difference unit with said local intermediate-freuqncy signal passage, is used for the energy value according to said local intermediate-freuqncy signal, said positive negative frequency deviation energy difference signal is carried out normalization handle;
Said frequency adjustment unit is connected with said energy difference normalization unit, is used for according to the said positive negative frequency deviation energy difference signal after the said normalization processing the local intermediate-freuqncy signal of local carrier equipment being adjusted.
5. digital signal frequency discriminator according to claim 4 is characterized in that, said forward off frequency carrier passage, negative sense off frequency carrier passage and local intermediate-freuqncy signal passage are handled based on synchronous input intermediate-freuqncy signal.
6. digital signal frequency discriminator according to claim 4 is characterized in that, this digital signal frequency discriminator also comprises:
Phase discriminator is connected with said local intermediate-freuqncy signal passage, is used for obtaining amount of phase error according to said input intermediate-freuqncy signal, and local intermediate-freuqncy signal is carried out the phase-locked loop adjustment.
7. digital signal frequency discriminator according to claim 1 is characterized in that, also comprises:
The loop filtering unit is connected between said frequency deviation energy difference unit and the frequency adjustment unit, is used for the noise of the said positive negative frequency deviation energy difference signal of filtering.
8. according to each described digital signal frequency discriminator among the claim 1-7, it is characterized in that:
Said forward off frequency carrier passage comprises first multiplier and first integral device; Wherein: this first multiplier; Be connected with local carrier equipment with said input intermediate frequency equipment, be used on said local intercarrier signal, adding preset frequency deviation, obtain forward off frequency carrier signal; This first integral device is connected with said first multiplier, is used for obtaining through correlation intergal the energy of said forward off frequency carrier signal;
Said negative sense off frequency carrier passage comprises second multiplier and second integral device; Wherein: this second multiplier; Be connected with local carrier equipment with said input intermediate frequency equipment; Be used on the local intermediate-freuqncy signal that said local carrier equipment produces, subtracting said preset frequency deviation, obtain negative sense off frequency carrier signal; This second integral device is connected with said second multiplier, is used for obtaining through correlation intergal the energy of said negative sense off frequency carrier signal.
9. according to each described digital signal frequency discriminator among the claim 1-7, it is characterized in that said frequency adjustment unit is a voltage controlled oscillator, said frequency deviation energy difference unit is a subtracter.
10. the method for a digital signal frequency discrimination is characterized in that, comprising:
On the local intermediate-freuqncy signal that said local carrier equipment produces, add preset frequency deviation; Obtain forward off frequency carrier signal; The input intermediate-freuqncy signal of said forward off frequency carrier signal and the input of said input intermediate frequency equipment is done correlation intergal, obtain the energy of said forward off frequency carrier signal;
On the local intermediate-freuqncy signal that said local carrier equipment produces, subtract said preset frequency deviation; Obtain negative sense off frequency carrier signal; The input intermediate-freuqncy signal of said negative sense off frequency carrier signal and the input of said input intermediate frequency equipment is done correlation intergal, obtain the energy of said negative sense off frequency carrier signal;
According to the energy of said forward off frequency carrier signal and negative sense off frequency carrier signal, obtain positive negative frequency deviation energy difference signal;
According to said positive negative frequency deviation energy difference signal, local intermediate-freuqncy signal is adjusted.
11. the method for digital signal frequency discrimination according to claim 10; It is characterized in that; Said preset frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the said correlation intergal time is for obtaining the time of integration of said forward/negative sense off frequency carrier signal energy.
12. the method for digital signal frequency discrimination according to claim 11 is characterized in that, said preset frequency deviation is to make said digital signal frequency discriminator work in the frequency deviation of the linear zone of said frequency discrimination indicatrix.
13. the method for digital signal frequency discrimination according to claim 10 is characterized in that:
Saidly on the local intermediate-freuqncy signal that local carrier equipment produces, add preset frequency deviation; Obtain forward off frequency carrier signal; The forward off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal; The step of obtaining the energy of forward off frequency carrier signal comprises: first multiplier adds preset frequency deviation on said local intercarrier signal, obtains forward off frequency carrier signal; This first integral device obtains the energy of said forward off frequency carrier signal through correlation intergal;
Saidly on the local intermediate-freuqncy signal that local carrier equipment produces, subtract preset frequency deviation; Obtain negative sense off frequency carrier signal; The negative sense off frequency carrier signal and the input intermediate-freuqncy signal of input intermediate frequency equipment input are done correlation intergal; The step of obtaining the energy of negative sense off frequency carrier signal comprises: second multiplier subtracts said preset frequency deviation on the local intermediate-freuqncy signal that said local carrier equipment produces, obtain negative sense off frequency carrier signal; The second integral device obtains the energy of said negative sense off frequency carrier signal through correlation intergal.
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| CN107727928A (en) * | 2017-09-20 | 2018-02-23 | 戴承萍 | A kind of data signal frequency discriminator and its application method |
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